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Volvo Engine >> CYL HEAD OIL GALLERY MODIFICATION


Cylinder Head Oil Gallery Modification On
1976-85 Volvo 2.1 & 2.3L Engines

AERA members have reported a cylinder head oil gallery modification for Volvo 2.1& 2.3L engines. To enhance upper engine oiling, simply increase the diameter of the oil gallery hole to .563 (14 mm). To do so, requires the removal of the cylinder head and a drilling operation.

This engine design may allow sludge to accumulate in the oil gallery over a period of time if poor oil maintenance exists. To reduce the possibility of a seized camshaft from lack of lubrication at start-up, the following modification should be made to the cylinder head.

1. Remove cylinder head and locate the oil gallery feed hole on
the head gasket surface as shown in illustration below.

2. Obtain a .563 (14 mm) drill, and drill perpendicularly down
a distance of 1.770 (45 mm).

3. Do all other machine operations and clean thoroughly before
placing back in service.

4. Clean crankcase ventilation system and verify those
components are the manufacturer's current design.

The AERA Technical Committee
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